| 1 | /* |
1 | /* |
| 2 | * This file is part of Crossfire TRT, the Multiplayer Online Role Playing Game. |
2 | * This file is part of Deliantra, the Roguelike Realtime MMORPG. |
| 3 | * |
3 | * |
| 4 | * Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT team |
4 | * Copyright (©) 2005,2006,2007,2008 Marc Alexander Lehmann / Robin Redeker / the Deliantra team |
| 5 | * |
5 | * |
| 6 | * Crossfire TRT is free software; you can redistribute it and/or modify it |
6 | * Deliantra is free software: you can redistribute it and/or modify it under |
| 7 | * under the terms of the GNU General Public License as published by the Free |
7 | * the terms of the Affero GNU General Public License as published by the |
| 8 | * Software Foundation; either version 2 of the License, or (at your option) |
8 | * Free Software Foundation, either version 3 of the License, or (at your |
| 9 | * any later version. |
9 | * option) any later version. |
| 10 | * |
10 | * |
| 11 | * This program is distributed in the hope that it will be useful, but |
11 | * This program is distributed in the hope that it will be useful, |
| 12 | * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * for more details. |
14 | * GNU General Public License for more details. |
| 15 | * |
15 | * |
| 16 | * You should have received a copy of the GNU General Public License along |
16 | * You should have received a copy of the Affero GNU General Public License |
| 17 | * with Crossfire TRT; if not, write to the Free Software Foundation, Inc. 51 |
17 | * and the GNU General Public License along with this program. If not, see |
| 18 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
18 | * <http://www.gnu.org/licenses/>. |
| 19 | * |
19 | * |
| 20 | * The authors can be reached via e-mail to <crossfire@schmorp.de> |
20 | * The authors can be reached via e-mail to <support@deliantra.net> |
| 21 | */ |
21 | */ |
| 22 | |
22 | |
| 23 | #ifndef UTIL_H__ |
23 | #ifndef UTIL_H__ |
| 24 | #define UTIL_H__ |
24 | #define UTIL_H__ |
| 25 | |
25 | |
| 26 | //#define PREFER_MALLOC |
26 | #define DEBUG_POISON 0x00 // poison memory before freeing it if != 0 |
|
|
27 | #define DEBUG_SALLOC 0 // add a debug wrapper around all sallocs |
|
|
28 | #define PREFER_MALLOC 0 // use malloc and not the slice allocator |
| 27 | |
29 | |
| 28 | #if __GNUC__ >= 3 |
30 | #if __GNUC__ >= 3 |
| 29 | # define is_constant(c) __builtin_constant_p (c) |
31 | # define is_constant(c) __builtin_constant_p (c) |
| 30 | # define expect(expr,value) __builtin_expect ((expr),(value)) |
32 | # define expect(expr,value) __builtin_expect ((expr),(value)) |
| 31 | # define prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) |
33 | # define prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) |
|
|
34 | # define noinline __attribute__((__noinline__)) |
| 32 | #else |
35 | #else |
| 33 | # define is_constant(c) 0 |
36 | # define is_constant(c) 0 |
| 34 | # define expect(expr,value) (expr) |
37 | # define expect(expr,value) (expr) |
| 35 | # define prefetch(addr,rw,locality) |
38 | # define prefetch(addr,rw,locality) |
|
|
39 | # define noinline |
|
|
40 | #endif |
|
|
41 | |
|
|
42 | #if __GNUC__ < 4 || (__GNUC__ == 4 || __GNUC_MINOR__ < 4) |
|
|
43 | # define decltype(x) typeof(x) |
| 36 | #endif |
44 | #endif |
| 37 | |
45 | |
| 38 | // put into ifs if you are very sure that the expression |
46 | // put into ifs if you are very sure that the expression |
| 39 | // is mostly true or mosty false. note that these return |
47 | // is mostly true or mosty false. note that these return |
| 40 | // booleans, not the expression. |
48 | // booleans, not the expression. |
| 41 | #define expect_false(expr) expect ((expr) != 0, 0) |
49 | #define expect_false(expr) expect ((expr) ? 1 : 0, 0) |
| 42 | #define expect_true(expr) expect ((expr) != 0, 1) |
50 | #define expect_true(expr) expect ((expr) ? 1 : 0, 1) |
|
|
51 | |
|
|
52 | #include <pthread.h> |
| 43 | |
53 | |
| 44 | #include <cstddef> |
54 | #include <cstddef> |
| 45 | #include <cmath> |
55 | #include <cmath> |
| 46 | #include <new> |
56 | #include <new> |
| 47 | #include <vector> |
57 | #include <vector> |
| … | |
… | |
| 49 | #include <glib.h> |
59 | #include <glib.h> |
| 50 | |
60 | |
| 51 | #include <shstr.h> |
61 | #include <shstr.h> |
| 52 | #include <traits.h> |
62 | #include <traits.h> |
| 53 | |
63 | |
|
|
64 | #if DEBUG_SALLOC |
|
|
65 | # define g_slice_alloc0(s) debug_slice_alloc0(s) |
|
|
66 | # define g_slice_alloc(s) debug_slice_alloc(s) |
|
|
67 | # define g_slice_free1(s,p) debug_slice_free1(s,p) |
|
|
68 | void *g_slice_alloc (unsigned long size); |
|
|
69 | void *g_slice_alloc0 (unsigned long size); |
|
|
70 | void g_slice_free1 (unsigned long size, void *ptr); |
|
|
71 | #elif PREFER_MALLOC |
|
|
72 | # define g_slice_alloc0(s) calloc (1, (s)) |
|
|
73 | # define g_slice_alloc(s) malloc ((s)) |
|
|
74 | # define g_slice_free1(s,p) free ((p)) |
|
|
75 | #endif |
|
|
76 | |
| 54 | // use a gcc extension for auto declarations until ISO C++ sanctifies them |
77 | // use C0X decltype for auto declarations until ISO C++ sanctifies them (if ever) |
| 55 | #define auto(var,expr) typeof(expr) var = (expr) |
78 | #define auto(var,expr) decltype(expr) var = (expr) |
| 56 | |
79 | |
| 57 | // very ugly macro that basicaly declares and initialises a variable |
80 | // very ugly macro that basically declares and initialises a variable |
| 58 | // that is in scope for the next statement only |
81 | // that is in scope for the next statement only |
| 59 | // works only for stuff that can be assigned 0 and converts to false |
82 | // works only for stuff that can be assigned 0 and converts to false |
| 60 | // (note: works great for pointers) |
83 | // (note: works great for pointers) |
| 61 | // most ugly macro I ever wrote |
84 | // most ugly macro I ever wrote |
| 62 | #define declvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1) |
85 | #define statementvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1) |
| 63 | |
86 | |
| 64 | // in range including end |
87 | // in range including end |
| 65 | #define IN_RANGE_INC(val,beg,end) \ |
88 | #define IN_RANGE_INC(val,beg,end) \ |
| 66 | ((unsigned int)(val) - (unsigned int)(beg) <= (unsigned int)(end) - (unsigned int)(beg)) |
89 | ((unsigned int)(val) - (unsigned int)(beg) <= (unsigned int)(end) - (unsigned int)(beg)) |
| 67 | |
90 | |
| 68 | // in range excluding end |
91 | // in range excluding end |
| 69 | #define IN_RANGE_EXC(val,beg,end) \ |
92 | #define IN_RANGE_EXC(val,beg,end) \ |
| 70 | ((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg)) |
93 | ((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg)) |
| 71 | |
94 | |
|
|
95 | void cleanup (const char *cause, bool make_core = false); |
| 72 | void fork_abort (const char *msg); |
96 | void fork_abort (const char *msg); |
| 73 | |
97 | |
| 74 | // rationale for using (U) not (T) is to reduce signed/unsigned issues, |
98 | // rationale for using (U) not (T) is to reduce signed/unsigned issues, |
| 75 | // as a is often a constant while b is the variable. it is still a bug, though. |
99 | // as a is often a constant while b is the variable. it is still a bug, though. |
| 76 | template<typename T, typename U> static inline T min (T a, U b) { return (U)a < b ? (U)a : b; } |
100 | template<typename T, typename U> static inline T min (T a, U b) { return (U)a < b ? (U)a : b; } |
| 77 | template<typename T, typename U> static inline T max (T a, U b) { return (U)a > b ? (U)a : b; } |
101 | template<typename T, typename U> static inline T max (T a, U b) { return (U)a > b ? (U)a : b; } |
| 78 | template<typename T, typename U, typename V> static inline T clamp (T v, U a, V b) { return v < (T)a ? (T)a : v >(T)b ? (T)b : v; } |
102 | template<typename T, typename U, typename V> static inline T clamp (T v, U a, V b) { return v < (T)a ? (T)a : v >(T)b ? (T)b : v; } |
| 79 | |
103 | |
|
|
104 | template<typename T, typename U> static inline void min_it (T &v, U m) { v = min (v, (T)m); } |
|
|
105 | template<typename T, typename U> static inline void max_it (T &v, U m) { v = max (v, (T)m); } |
|
|
106 | template<typename T, typename U, typename V> static inline void clamp_it (T &v, U a, V b) { v = clamp (v, (T)a, (T)b); } |
|
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107 | |
| 80 | template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; } |
108 | template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; } |
| 81 | |
109 | |
|
|
110 | template<typename T, typename U, typename V> static inline T min (T a, U b, V c) { return min (a, min (b, c)); } |
|
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111 | template<typename T, typename U, typename V> static inline T max (T a, U b, V c) { return max (a, max (b, c)); } |
|
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112 | |
|
|
113 | // sign returns -1 or +1 |
|
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114 | template<typename T> |
|
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115 | static inline T sign (T v) { return v < 0 ? -1 : +1; } |
|
|
116 | // relies on 2c representation |
|
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117 | template<> |
|
|
118 | inline sint8 sign (sint8 v) { return 1 - (sint8 (uint8 (v) >> 7) * 2); } |
|
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119 | |
|
|
120 | // sign0 returns -1, 0 or +1 |
|
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121 | template<typename T> |
|
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122 | static inline T sign0 (T v) { return v ? sign (v) : 0; } |
|
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123 | |
|
|
124 | // div* only work correctly for div > 0 |
|
|
125 | // div, with correct rounding (< 0.5 downwards, >=0.5 upwards) |
|
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126 | template<typename T> static inline T div (T val, T div) |
|
|
127 | { |
|
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128 | return expect_false (val < 0) ? - ((-val + (div - 1) / 2) / div) : (val + div / 2) / div; |
|
|
129 | } |
|
|
130 | // div, round-up |
|
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131 | template<typename T> static inline T div_ru (T val, T div) |
|
|
132 | { |
|
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133 | return expect_false (val < 0) ? - ((-val ) / div) : (val + div - 1) / div; |
|
|
134 | } |
|
|
135 | // div, round-down |
|
|
136 | template<typename T> static inline T div_rd (T val, T div) |
|
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137 | { |
|
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138 | return expect_false (val < 0) ? - ((-val + (div - 1) ) / div) : (val ) / div; |
|
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139 | } |
|
|
140 | |
|
|
141 | // lerp* only work correctly for min_in < max_in |
|
|
142 | // Linear intERPolate, scales val from min_in..max_in to min_out..max_out |
| 82 | template<typename T> |
143 | template<typename T> |
| 83 | static inline T |
144 | static inline T |
| 84 | lerp (T val, T min_in, T max_in, T min_out, T max_out) |
145 | lerp (T val, T min_in, T max_in, T min_out, T max_out) |
| 85 | { |
146 | { |
| 86 | return (val - min_in) * (max_out - min_out) / (max_in - min_in) + min_out; |
147 | return min_out + div <T> ((val - min_in) * (max_out - min_out), max_in - min_in); |
|
|
148 | } |
|
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149 | |
|
|
150 | // lerp, round-down |
|
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151 | template<typename T> |
|
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152 | static inline T |
|
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153 | lerp_rd (T val, T min_in, T max_in, T min_out, T max_out) |
|
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154 | { |
|
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155 | return min_out + div_rd<T> ((val - min_in) * (max_out - min_out), max_in - min_in); |
|
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156 | } |
|
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157 | |
|
|
158 | // lerp, round-up |
|
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159 | template<typename T> |
|
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160 | static inline T |
|
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161 | lerp_ru (T val, T min_in, T max_in, T min_out, T max_out) |
|
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162 | { |
|
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163 | return min_out + div_ru<T> ((val - min_in) * (max_out - min_out), max_in - min_in); |
| 87 | } |
164 | } |
| 88 | |
165 | |
| 89 | // lots of stuff taken from FXT |
166 | // lots of stuff taken from FXT |
| 90 | |
167 | |
| 91 | /* Rotate right. This is used in various places for checksumming */ |
168 | /* Rotate right. This is used in various places for checksumming */ |
| … | |
… | |
| 135 | // on modern cpus |
212 | // on modern cpus |
| 136 | inline int |
213 | inline int |
| 137 | isqrt (int n) |
214 | isqrt (int n) |
| 138 | { |
215 | { |
| 139 | return (int)sqrtf ((float)n); |
216 | return (int)sqrtf ((float)n); |
|
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217 | } |
|
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218 | |
|
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219 | // this is kind of like the ^^ operator, if it would exist, without sequence point. |
|
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220 | // more handy than it looks like, due to the implicit !! done on its arguments |
|
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221 | inline bool |
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222 | logical_xor (bool a, bool b) |
|
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223 | { |
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224 | return a != b; |
|
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225 | } |
|
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226 | |
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227 | inline bool |
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228 | logical_implies (bool a, bool b) |
|
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229 | { |
|
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230 | return a <= b; |
| 140 | } |
231 | } |
| 141 | |
232 | |
| 142 | // this is only twice as fast as naive sqrtf (dx*dy+dy*dy) |
233 | // this is only twice as fast as naive sqrtf (dx*dy+dy*dy) |
| 143 | #if 0 |
234 | #if 0 |
| 144 | // and has a max. error of 6 in the range -100..+100. |
235 | // and has a max. error of 6 in the range -100..+100. |
| … | |
… | |
| 169 | absdir (int d) |
260 | absdir (int d) |
| 170 | { |
261 | { |
| 171 | return ((d - 1) & 7) + 1; |
262 | return ((d - 1) & 7) + 1; |
| 172 | } |
263 | } |
| 173 | |
264 | |
|
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265 | extern ssize_t slice_alloc; // statistics |
|
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266 | |
|
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267 | void *salloc_ (int n) throw (std::bad_alloc); |
|
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268 | void *salloc_ (int n, void *src) throw (std::bad_alloc); |
|
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269 | |
|
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270 | // strictly the same as g_slice_alloc, but never returns 0 |
|
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271 | template<typename T> |
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272 | inline T *salloc (int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T)); } |
|
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273 | |
|
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274 | // also copies src into the new area, like "memdup" |
|
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275 | // if src is 0, clears the memory |
|
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276 | template<typename T> |
|
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277 | inline T *salloc (int n, T *src) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), (void *)src); } |
|
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278 | |
|
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279 | // clears the memory |
|
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280 | template<typename T> |
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281 | inline T *salloc0(int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), 0); } |
|
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282 | |
|
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283 | // for symmetry |
|
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284 | template<typename T> |
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285 | inline void sfree (T *ptr, int n = 1) throw () |
|
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286 | { |
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287 | if (expect_true (ptr)) |
|
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288 | { |
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289 | slice_alloc -= n * sizeof (T); |
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290 | if (DEBUG_POISON) memset (ptr, DEBUG_POISON, n * sizeof (T)); |
|
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291 | g_slice_free1 (n * sizeof (T), (void *)ptr); |
|
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292 | assert (slice_alloc >= 0);//D |
|
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293 | } |
|
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294 | } |
|
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295 | |
|
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296 | // nulls the pointer |
|
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297 | template<typename T> |
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298 | inline void sfree0 (T *&ptr, int n = 1) throw () |
|
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299 | { |
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300 | sfree<T> (ptr, n); |
|
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301 | ptr = 0; |
|
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302 | } |
|
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303 | |
| 174 | // makes dynamically allocated objects zero-initialised |
304 | // makes dynamically allocated objects zero-initialised |
| 175 | struct zero_initialised |
305 | struct zero_initialised |
| 176 | { |
306 | { |
| 177 | void *operator new (size_t s, void *p) |
307 | void *operator new (size_t s, void *p) |
| 178 | { |
308 | { |
| … | |
… | |
| 180 | return p; |
310 | return p; |
| 181 | } |
311 | } |
| 182 | |
312 | |
| 183 | void *operator new (size_t s) |
313 | void *operator new (size_t s) |
| 184 | { |
314 | { |
| 185 | return g_slice_alloc0 (s); |
315 | return salloc0<char> (s); |
| 186 | } |
316 | } |
| 187 | |
317 | |
| 188 | void *operator new[] (size_t s) |
318 | void *operator new[] (size_t s) |
| 189 | { |
319 | { |
| 190 | return g_slice_alloc0 (s); |
320 | return salloc0<char> (s); |
| 191 | } |
321 | } |
| 192 | |
322 | |
| 193 | void operator delete (void *p, size_t s) |
323 | void operator delete (void *p, size_t s) |
| 194 | { |
324 | { |
| 195 | g_slice_free1 (s, p); |
325 | sfree ((char *)p, s); |
| 196 | } |
326 | } |
| 197 | |
327 | |
| 198 | void operator delete[] (void *p, size_t s) |
328 | void operator delete[] (void *p, size_t s) |
| 199 | { |
329 | { |
| 200 | g_slice_free1 (s, p); |
330 | sfree ((char *)p, s); |
| 201 | } |
331 | } |
| 202 | }; |
332 | }; |
| 203 | |
333 | |
| 204 | void *salloc_ (int n) throw (std::bad_alloc); |
334 | // makes dynamically allocated objects zero-initialised |
| 205 | void *salloc_ (int n, void *src) throw (std::bad_alloc); |
335 | struct slice_allocated |
| 206 | |
|
|
| 207 | // strictly the same as g_slice_alloc, but never returns 0 |
|
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| 208 | template<typename T> |
|
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| 209 | inline T *salloc (int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T)); } |
|
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| 210 | |
|
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| 211 | // also copies src into the new area, like "memdup" |
|
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| 212 | // if src is 0, clears the memory |
|
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| 213 | template<typename T> |
|
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| 214 | inline T *salloc (int n, T *src) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), (void *)src); } |
|
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| 215 | |
|
|
| 216 | // clears the memory |
|
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| 217 | template<typename T> |
|
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| 218 | inline T *salloc0(int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), 0); } |
|
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| 219 | |
|
|
| 220 | // for symmetry |
|
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| 221 | template<typename T> |
|
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| 222 | inline void sfree (T *ptr, int n = 1) throw () |
|
|
| 223 | { |
336 | { |
| 224 | #ifdef PREFER_MALLOC |
337 | void *operator new (size_t s, void *p) |
| 225 | free (ptr); |
338 | { |
| 226 | #else |
339 | return p; |
| 227 | g_slice_free1 (n * sizeof (T), (void *)ptr); |
340 | } |
| 228 | #endif |
341 | |
| 229 | } |
342 | void *operator new (size_t s) |
|
|
343 | { |
|
|
344 | return salloc<char> (s); |
|
|
345 | } |
|
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346 | |
|
|
347 | void *operator new[] (size_t s) |
|
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348 | { |
|
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349 | return salloc<char> (s); |
|
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350 | } |
|
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351 | |
|
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352 | void operator delete (void *p, size_t s) |
|
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353 | { |
|
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354 | sfree ((char *)p, s); |
|
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355 | } |
|
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356 | |
|
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357 | void operator delete[] (void *p, size_t s) |
|
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358 | { |
|
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359 | sfree ((char *)p, s); |
|
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360 | } |
|
|
361 | }; |
| 230 | |
362 | |
| 231 | // a STL-compatible allocator that uses g_slice |
363 | // a STL-compatible allocator that uses g_slice |
| 232 | // boy, this is verbose |
364 | // boy, this is verbose |
| 233 | template<typename Tp> |
365 | template<typename Tp> |
| 234 | struct slice_allocator |
366 | struct slice_allocator |
| … | |
… | |
| 246 | { |
378 | { |
| 247 | typedef slice_allocator<U> other; |
379 | typedef slice_allocator<U> other; |
| 248 | }; |
380 | }; |
| 249 | |
381 | |
| 250 | slice_allocator () throw () { } |
382 | slice_allocator () throw () { } |
| 251 | slice_allocator (const slice_allocator &o) throw () { } |
383 | slice_allocator (const slice_allocator &) throw () { } |
| 252 | template<typename Tp2> |
384 | template<typename Tp2> |
| 253 | slice_allocator (const slice_allocator<Tp2> &) throw () { } |
385 | slice_allocator (const slice_allocator<Tp2> &) throw () { } |
| 254 | |
386 | |
| 255 | ~slice_allocator () { } |
387 | ~slice_allocator () { } |
| 256 | |
388 | |
| … | |
… | |
| 265 | void deallocate (pointer p, size_type n) |
397 | void deallocate (pointer p, size_type n) |
| 266 | { |
398 | { |
| 267 | sfree<Tp> (p, n); |
399 | sfree<Tp> (p, n); |
| 268 | } |
400 | } |
| 269 | |
401 | |
| 270 | size_type max_size ()const throw () |
402 | size_type max_size () const throw () |
| 271 | { |
403 | { |
| 272 | return size_t (-1) / sizeof (Tp); |
404 | return size_t (-1) / sizeof (Tp); |
| 273 | } |
405 | } |
| 274 | |
406 | |
| 275 | void construct (pointer p, const Tp &val) |
407 | void construct (pointer p, const Tp &val) |
| … | |
… | |
| 286 | // P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213. |
418 | // P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213. |
| 287 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps |
419 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps |
| 288 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps |
420 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps |
| 289 | struct tausworthe_random_generator |
421 | struct tausworthe_random_generator |
| 290 | { |
422 | { |
| 291 | // generator |
|
|
| 292 | uint32_t state [4]; |
423 | uint32_t state [4]; |
| 293 | |
424 | |
| 294 | void operator =(const tausworthe_random_generator &src) |
425 | void operator =(const tausworthe_random_generator &src) |
| 295 | { |
426 | { |
| 296 | state [0] = src.state [0]; |
427 | state [0] = src.state [0]; |
| … | |
… | |
| 299 | state [3] = src.state [3]; |
430 | state [3] = src.state [3]; |
| 300 | } |
431 | } |
| 301 | |
432 | |
| 302 | void seed (uint32_t seed); |
433 | void seed (uint32_t seed); |
| 303 | uint32_t next (); |
434 | uint32_t next (); |
|
|
435 | }; |
| 304 | |
436 | |
| 305 | // uniform distribution |
437 | // Xorshift RNGs, George Marsaglia |
|
|
438 | // http://www.jstatsoft.org/v08/i14/paper |
|
|
439 | // this one is about 40% faster than the tausworthe one above (i.e. not much), |
|
|
440 | // despite the inlining, and has the issue of only creating 2**32-1 numbers. |
|
|
441 | // see also http://www.iro.umontreal.ca/~lecuyer/myftp/papers/xorshift.pdf |
|
|
442 | struct xorshift_random_generator |
|
|
443 | { |
|
|
444 | uint32_t x, y; |
|
|
445 | |
|
|
446 | void operator =(const xorshift_random_generator &src) |
|
|
447 | { |
|
|
448 | x = src.x; |
|
|
449 | y = src.y; |
|
|
450 | } |
|
|
451 | |
|
|
452 | void seed (uint32_t seed) |
|
|
453 | { |
|
|
454 | x = seed; |
|
|
455 | y = seed * 69069U; |
|
|
456 | } |
|
|
457 | |
|
|
458 | uint32_t next () |
|
|
459 | { |
|
|
460 | uint32_t t = x ^ (x << 10); |
|
|
461 | x = y; |
|
|
462 | y = y ^ (y >> 13) ^ t ^ (t >> 10); |
|
|
463 | return y; |
|
|
464 | } |
|
|
465 | }; |
|
|
466 | |
|
|
467 | template<class generator> |
|
|
468 | struct random_number_generator : generator |
|
|
469 | { |
|
|
470 | // uniform distribution, 0 .. max (0, num - 1) |
| 306 | uint32_t operator ()(uint32_t num) |
471 | uint32_t operator ()(uint32_t num) |
| 307 | { |
472 | { |
| 308 | return is_constant (num) |
473 | return !is_constant (num) ? get_range (num) // non-constant |
| 309 | ? (next () * (uint64_t)num) >> 32U |
474 | : num & (num - 1) ? (this->next () * (uint64_t)num) >> 32U // constant, non-power-of-two |
| 310 | : get_range (num); |
475 | : this->next () & (num - 1); // constant, power-of-two |
| 311 | } |
476 | } |
| 312 | |
477 | |
| 313 | // return a number within (min .. max) |
478 | // return a number within (min .. max) |
| 314 | int operator () (int r_min, int r_max) |
479 | int operator () (int r_min, int r_max) |
| 315 | { |
480 | { |
| … | |
… | |
| 326 | protected: |
491 | protected: |
| 327 | uint32_t get_range (uint32_t r_max); |
492 | uint32_t get_range (uint32_t r_max); |
| 328 | int get_range (int r_min, int r_max); |
493 | int get_range (int r_min, int r_max); |
| 329 | }; |
494 | }; |
| 330 | |
495 | |
| 331 | typedef tausworthe_random_generator rand_gen; |
496 | typedef random_number_generator<tausworthe_random_generator> rand_gen; |
| 332 | |
497 | |
| 333 | extern rand_gen rndm; |
498 | extern rand_gen rndm, rmg_rndm; |
|
|
499 | |
|
|
500 | INTERFACE_CLASS (attachable) |
|
|
501 | struct refcnt_base |
|
|
502 | { |
|
|
503 | typedef int refcnt_t; |
|
|
504 | mutable refcnt_t ACC (RW, refcnt); |
|
|
505 | |
|
|
506 | MTH void refcnt_inc () const { ++refcnt; } |
|
|
507 | MTH void refcnt_dec () const { --refcnt; } |
|
|
508 | |
|
|
509 | refcnt_base () : refcnt (0) { } |
|
|
510 | }; |
|
|
511 | |
|
|
512 | // to avoid branches with more advanced compilers |
|
|
513 | extern refcnt_base::refcnt_t refcnt_dummy; |
| 334 | |
514 | |
| 335 | template<class T> |
515 | template<class T> |
| 336 | struct refptr |
516 | struct refptr |
| 337 | { |
517 | { |
|
|
518 | // p if not null |
|
|
519 | refcnt_base::refcnt_t *refcnt_ref () { return p ? &p->refcnt : &refcnt_dummy; } |
|
|
520 | |
|
|
521 | void refcnt_dec () |
|
|
522 | { |
|
|
523 | if (!is_constant (p)) |
|
|
524 | --*refcnt_ref (); |
|
|
525 | else if (p) |
|
|
526 | --p->refcnt; |
|
|
527 | } |
|
|
528 | |
|
|
529 | void refcnt_inc () |
|
|
530 | { |
|
|
531 | if (!is_constant (p)) |
|
|
532 | ++*refcnt_ref (); |
|
|
533 | else if (p) |
|
|
534 | ++p->refcnt; |
|
|
535 | } |
|
|
536 | |
| 338 | T *p; |
537 | T *p; |
| 339 | |
538 | |
| 340 | refptr () : p(0) { } |
539 | refptr () : p(0) { } |
| 341 | refptr (const refptr<T> &p) : p(p.p) { if (p) p->refcnt_inc (); } |
540 | refptr (const refptr<T> &p) : p(p.p) { refcnt_inc (); } |
| 342 | refptr (T *p) : p(p) { if (p) p->refcnt_inc (); } |
541 | refptr (T *p) : p(p) { refcnt_inc (); } |
| 343 | ~refptr () { if (p) p->refcnt_dec (); } |
542 | ~refptr () { refcnt_dec (); } |
| 344 | |
543 | |
| 345 | const refptr<T> &operator =(T *o) |
544 | const refptr<T> &operator =(T *o) |
| 346 | { |
545 | { |
|
|
546 | // if decrementing ever destroys we need to reverse the order here |
| 347 | if (p) p->refcnt_dec (); |
547 | refcnt_dec (); |
| 348 | p = o; |
548 | p = o; |
| 349 | if (p) p->refcnt_inc (); |
549 | refcnt_inc (); |
| 350 | |
|
|
| 351 | return *this; |
550 | return *this; |
| 352 | } |
551 | } |
| 353 | |
552 | |
| 354 | const refptr<T> &operator =(const refptr<T> o) |
553 | const refptr<T> &operator =(const refptr<T> &o) |
| 355 | { |
554 | { |
| 356 | *this = o.p; |
555 | *this = o.p; |
| 357 | return *this; |
556 | return *this; |
| 358 | } |
557 | } |
| 359 | |
558 | |
| 360 | T &operator * () const { return *p; } |
559 | T &operator * () const { return *p; } |
| 361 | T *operator ->() const { return p; } |
560 | T *operator ->() const { return p; } |
| 362 | |
561 | |
| 363 | operator T *() const { return p; } |
562 | operator T *() const { return p; } |
| 364 | }; |
563 | }; |
| 365 | |
564 | |
| 366 | typedef refptr<maptile> maptile_ptr; |
565 | typedef refptr<maptile> maptile_ptr; |
| … | |
… | |
| 371 | |
570 | |
| 372 | struct str_hash |
571 | struct str_hash |
| 373 | { |
572 | { |
| 374 | std::size_t operator ()(const char *s) const |
573 | std::size_t operator ()(const char *s) const |
| 375 | { |
574 | { |
| 376 | unsigned long hash = 0; |
575 | #if 0 |
|
|
576 | uint32_t hash = 0; |
| 377 | |
577 | |
| 378 | /* use the one-at-a-time hash function, which supposedly is |
578 | /* use the one-at-a-time hash function, which supposedly is |
| 379 | * better than the djb2-like one used by perl5.005, but |
579 | * better than the djb2-like one used by perl5.005, but |
| 380 | * certainly is better then the bug used here before. |
580 | * certainly is better then the bug used here before. |
| 381 | * see http://burtleburtle.net/bob/hash/doobs.html |
581 | * see http://burtleburtle.net/bob/hash/doobs.html |
| … | |
… | |
| 388 | } |
588 | } |
| 389 | |
589 | |
| 390 | hash += hash << 3; |
590 | hash += hash << 3; |
| 391 | hash ^= hash >> 11; |
591 | hash ^= hash >> 11; |
| 392 | hash += hash << 15; |
592 | hash += hash << 15; |
|
|
593 | #else |
|
|
594 | // use FNV-1a hash (http://isthe.com/chongo/tech/comp/fnv/) |
|
|
595 | // it is about twice as fast as the one-at-a-time one, |
|
|
596 | // with good distribution. |
|
|
597 | // FNV-1a is faster on many cpus because the multiplication |
|
|
598 | // runs concurrent with the looping logic. |
|
|
599 | uint32_t hash = 2166136261; |
|
|
600 | |
|
|
601 | while (*s) |
|
|
602 | hash = (hash ^ *s++) * 16777619; |
|
|
603 | #endif |
| 393 | |
604 | |
| 394 | return hash; |
605 | return hash; |
| 395 | } |
606 | } |
| 396 | }; |
607 | }; |
| 397 | |
608 | |
| … | |
… | |
| 401 | { |
612 | { |
| 402 | return !strcmp (a, b); |
613 | return !strcmp (a, b); |
| 403 | } |
614 | } |
| 404 | }; |
615 | }; |
| 405 | |
616 | |
|
|
617 | // Mostly the same as std::vector, but insert/erase can reorder |
|
|
618 | // the elements, making append(=insert)/remove O(1) instead of O(n). |
|
|
619 | // |
|
|
620 | // NOTE: only some forms of erase are available |
| 406 | template<class T> |
621 | template<class T> |
| 407 | struct unordered_vector : std::vector<T, slice_allocator<T> > |
622 | struct unordered_vector : std::vector<T, slice_allocator<T> > |
| 408 | { |
623 | { |
| 409 | typedef typename unordered_vector::iterator iterator; |
624 | typedef typename unordered_vector::iterator iterator; |
| 410 | |
625 | |
| … | |
… | |
| 420 | { |
635 | { |
| 421 | erase ((unsigned int )(i - this->begin ())); |
636 | erase ((unsigned int )(i - this->begin ())); |
| 422 | } |
637 | } |
| 423 | }; |
638 | }; |
| 424 | |
639 | |
| 425 | template<class T, int T::* index> |
640 | // This container blends advantages of linked lists |
|
|
641 | // (efficiency) with vectors (random access) by |
|
|
642 | // by using an unordered vector and storing the vector |
|
|
643 | // index inside the object. |
|
|
644 | // |
|
|
645 | // + memory-efficient on most 64 bit archs |
|
|
646 | // + O(1) insert/remove |
|
|
647 | // + free unique (but varying) id for inserted objects |
|
|
648 | // + cache-friendly iteration |
|
|
649 | // - only works for pointers to structs |
|
|
650 | // |
|
|
651 | // NOTE: only some forms of erase/insert are available |
|
|
652 | typedef int object_vector_index; |
|
|
653 | |
|
|
654 | template<class T, object_vector_index T::*indexmember> |
| 426 | struct object_vector : std::vector<T *, slice_allocator<T *> > |
655 | struct object_vector : std::vector<T *, slice_allocator<T *> > |
| 427 | { |
656 | { |
|
|
657 | typedef typename object_vector::iterator iterator; |
|
|
658 | |
|
|
659 | bool contains (const T *obj) const |
|
|
660 | { |
|
|
661 | return obj->*indexmember; |
|
|
662 | } |
|
|
663 | |
|
|
664 | iterator find (const T *obj) |
|
|
665 | { |
|
|
666 | return obj->*indexmember |
|
|
667 | ? this->begin () + obj->*indexmember - 1 |
|
|
668 | : this->end (); |
|
|
669 | } |
|
|
670 | |
|
|
671 | void push_back (T *obj) |
|
|
672 | { |
|
|
673 | std::vector<T *, slice_allocator<T *> >::push_back (obj); |
|
|
674 | obj->*indexmember = this->size (); |
|
|
675 | } |
|
|
676 | |
| 428 | void insert (T *obj) |
677 | void insert (T *obj) |
| 429 | { |
678 | { |
| 430 | assert (!(obj->*index)); |
|
|
| 431 | push_back (obj); |
679 | push_back (obj); |
| 432 | obj->*index = this->size (); |
|
|
| 433 | } |
680 | } |
| 434 | |
681 | |
| 435 | void insert (T &obj) |
682 | void insert (T &obj) |
| 436 | { |
683 | { |
| 437 | insert (&obj); |
684 | insert (&obj); |
| 438 | } |
685 | } |
| 439 | |
686 | |
| 440 | void erase (T *obj) |
687 | void erase (T *obj) |
| 441 | { |
688 | { |
| 442 | assert (obj->*index); |
|
|
| 443 | unsigned int pos = obj->*index; |
689 | unsigned int pos = obj->*indexmember; |
| 444 | obj->*index = 0; |
690 | obj->*indexmember = 0; |
| 445 | |
691 | |
| 446 | if (pos < this->size ()) |
692 | if (pos < this->size ()) |
| 447 | { |
693 | { |
| 448 | (*this)[pos - 1] = (*this)[this->size () - 1]; |
694 | (*this)[pos - 1] = (*this)[this->size () - 1]; |
| 449 | (*this)[pos - 1]->*index = pos; |
695 | (*this)[pos - 1]->*indexmember = pos; |
| 450 | } |
696 | } |
| 451 | |
697 | |
| 452 | this->pop_back (); |
698 | this->pop_back (); |
| 453 | } |
699 | } |
| 454 | |
700 | |
| 455 | void erase (T &obj) |
701 | void erase (T &obj) |
| 456 | { |
702 | { |
| 457 | errase (&obj); |
703 | erase (&obj); |
| 458 | } |
704 | } |
| 459 | }; |
705 | }; |
| 460 | |
706 | |
| 461 | // basically does what strncpy should do, but appends "..." to strings exceeding length |
707 | // basically does what strncpy should do, but appends "..." to strings exceeding length |
|
|
708 | // returns the number of bytes actually used (including \0) |
| 462 | void assign (char *dst, const char *src, int maxlen); |
709 | int assign (char *dst, const char *src, int maxsize); |
| 463 | |
710 | |
| 464 | // type-safe version of assign |
711 | // type-safe version of assign |
| 465 | template<int N> |
712 | template<int N> |
| 466 | inline void assign (char (&dst)[N], const char *src) |
713 | inline int assign (char (&dst)[N], const char *src) |
| 467 | { |
714 | { |
| 468 | assign ((char *)&dst, src, N); |
715 | return assign ((char *)&dst, src, N); |
| 469 | } |
716 | } |
| 470 | |
717 | |
| 471 | typedef double tstamp; |
718 | typedef double tstamp; |
| 472 | |
719 | |
| 473 | // return current time as timestampe |
720 | // return current time as timestamp |
| 474 | tstamp now (); |
721 | tstamp now (); |
| 475 | |
722 | |
| 476 | int similar_direction (int a, int b); |
723 | int similar_direction (int a, int b); |
| 477 | |
724 | |
| 478 | // like printf, but returns a std::string |
725 | // like v?sprintf, but returns a "static" buffer |
|
|
726 | char *vformat (const char *format, va_list ap); |
| 479 | const std::string format (const char *format, ...); |
727 | char *format (const char *format, ...); |
| 480 | |
728 | |
|
|
729 | // safety-check player input which will become object->msg |
|
|
730 | bool msg_is_safe (const char *msg); |
|
|
731 | |
|
|
732 | ///////////////////////////////////////////////////////////////////////////// |
|
|
733 | // threads, very very thin wrappers around pthreads |
|
|
734 | |
|
|
735 | struct thread |
|
|
736 | { |
|
|
737 | pthread_t id; |
|
|
738 | |
|
|
739 | void start (void *(*start_routine)(void *), void *arg = 0); |
|
|
740 | |
|
|
741 | void cancel () |
|
|
742 | { |
|
|
743 | pthread_cancel (id); |
|
|
744 | } |
|
|
745 | |
|
|
746 | void *join () |
|
|
747 | { |
|
|
748 | void *ret; |
|
|
749 | |
|
|
750 | if (pthread_join (id, &ret)) |
|
|
751 | cleanup ("pthread_join failed", 1); |
|
|
752 | |
|
|
753 | return ret; |
|
|
754 | } |
|
|
755 | }; |
|
|
756 | |
|
|
757 | // note that mutexes are not classes |
|
|
758 | typedef pthread_mutex_t smutex; |
|
|
759 | |
|
|
760 | #if __linux && defined (PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP) |
|
|
761 | #define SMUTEX_INITIALISER PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP |
|
|
762 | #else |
|
|
763 | #define SMUTEX_INITIALISER PTHREAD_MUTEX_INITIALIZER |
| 481 | #endif |
764 | #endif |
| 482 | |
765 | |
|
|
766 | #define SMUTEX(name) smutex name = SMUTEX_INITIALISER |
|
|
767 | #define SMUTEX_LOCK(name) pthread_mutex_lock (&(name)) |
|
|
768 | #define SMUTEX_UNLOCK(name) pthread_mutex_unlock (&(name)) |
|
|
769 | |
|
|
770 | typedef pthread_cond_t scond; |
|
|
771 | |
|
|
772 | #define SCOND(name) scond name = PTHREAD_COND_INITIALIZER |
|
|
773 | #define SCOND_SIGNAL(name) pthread_cond_signal (&(name)) |
|
|
774 | #define SCOND_BROADCAST(name) pthread_cond_broadcast (&(name)) |
|
|
775 | #define SCOND_WAIT(name,mutex) pthread_cond_wait (&(name), &(mutex)) |
|
|
776 | |
|
|
777 | #endif |
|
|
778 | |
